How do I paste at new point with middle click?

[Bruce Korb]

It used to work that way, but with a new installation and a clobbered
~/.emacs file,
it doesn't any more. My search terms haven't located the answer. If I
want to paste
at the current point, I'd use Ctl-y. I used to demarcate a region with
left-click and
right-click and then drop the selection in a new place with
middle-click. Quick. Easy.
Dunno what setting must have done that :(

Thank you in advance!  - Bruce